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                        自述
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                            <b>1.</b>
                        
                        介绍
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                            <b>1.1.</b>
                        
                        动机
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                            <b>1.2.</b>
                        
                        核心概念
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                            <b>1.3.</b>
                        
                        三大原则
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                            <b>1.4.</b>
                        
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                            <b>1.5.</b>
                        
                        生态系统
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                        示例
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                            <b>2.</b>
                        
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                            <b>2.1.</b>
                        
                        Action
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                            <b>2.2.</b>
                        
                        Reducer
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                            <b>2.3.</b>
                        
                        Store
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                            <b>2.4.</b>
                        
                        数据流
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                            <b>2.5.</b>
                        
                        搭配 React
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                            <b>2.6.</b>
                        
                        示例：Todo List
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                            <b>3.</b>
                        
                        高级
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                            <b>3.1.</b>
                        
                        异步 Action
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                            <b>3.2.</b>
                        
                        异步数据流
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                            <b>3.3.</b>
                        
                        Middleware
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                            <b>3.4.</b>
                        
                        搭配 React Router
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                            <b>3.5.</b>
                        
                        示例：Reddit API
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                            <b>3.6.</b>
                        
                        下一步
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                            <b>4.</b>
                        
                        技巧
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                            <b>4.1.</b>
                        
                        迁移到 Redux
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                            <b>4.2.</b>
                        
                        使用对象展开运算符
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                            <b>4.3.</b>
                        
                        减少样板代码
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                            <b>4.4.</b>
                        
                        服务端渲染
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                            <b>4.5.</b>
                        
                        编写测试
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                            <b>4.6.</b>
                        
                        计算衍生数据
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                            <b>4.7.</b>
                        
                        实现撤销重做
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                            <b>4.8.</b>
                        
                        子应用隔离
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                            <b>4.9.</b>
                        
                        组织 Reducer
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                            <b>4.9.1.</b>
                        
                        Reducer 基础概念
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                            <b>4.9.2.</b>
                        
                        Reducer 基础结构
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                            <b>4.9.3.</b>
                        
                        Reducer 逻辑拆分
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                            <b>4.9.4.</b>
                        
                        Reducer 重构示例
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                            <b>4.9.5.</b>
                        
                        `combineReducers` 用法
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                            <b>4.9.6.</b>
                        
                        `combineReducers` 进阶
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        <li class="chapter " data-level="4.9.7" data-path="docs/recipes/reducers/NormalizingStateShape.html">
            
                
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                            <b>4.9.7.</b>
                        
                        State 范式化
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                            <b>4.9.8.</b>
                        
                        管理范式化数据
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        <li class="chapter " data-level="4.9.9" data-path="docs/recipes/reducers/ReusingReducerLogic.html">
            
                
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                            <b>4.9.9.</b>
                        
                        Reducer 逻辑复用
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        <li class="chapter active" data-level="4.9.10" data-path="docs/recipes/reducers/ImmutableUpdatePatterns.html">
            
                
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                            <b>4.9.10.</b>
                        
                        不可变更新模式
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        <li class="chapter " data-level="4.9.11" data-path="docs/recipes/reducers/InitializingState.html">
            
                
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                            <b>4.9.11.</b>
                        
                        初始化 State
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                            <b>5.</b>
                        
                        常见问题
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                            <b>5.1.</b>
                        
                        综合
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        <li class="chapter " data-level="5.2" data-path="docs/faq/Reducers.html">
            
                
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                            <b>5.2.</b>
                        
                        Reducer
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        <li class="chapter " data-level="5.3" data-path="docs/faq/OrganizingState.html">
            
                
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                            <b>5.3.</b>
                        
                        组织 State
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        <li class="chapter " data-level="5.4" data-path="docs/faq/StoreSetup.html">
            
                
                    <a href="../../../docs/faq/StoreSetup.html">
                
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                            <b>5.4.</b>
                        
                        创建 Store
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        <li class="chapter " data-level="5.5" data-path="docs/faq/Actions.html">
            
                
                    <a href="../../../docs/faq/Actions.html">
                
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                            <b>5.5.</b>
                        
                        Action
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        <li class="chapter " data-level="5.6" data-path="docs/faq/CodeStructure.html">
            
                
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                            <b>5.6.</b>
                        
                        代码结构
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        <li class="chapter " data-level="5.7" data-path="docs/faq/Performance.html">
            
                
                    <a href="../../../docs/faq/Performance.html">
                
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                            <b>5.7.</b>
                        
                        性能
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        <li class="chapter " data-level="5.8" data-path="docs/faq/ReactRedux.html">
            
                
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                            <b>5.8.</b>
                        
                        React Redux
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        <li class="chapter " data-level="5.9" data-path="docs/faq/Miscellaneous.html">
            
                
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                            <b>5.9.</b>
                        
                        其它
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            </ul>
            
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        <li class="chapter " data-level="6" data-path="docs/Troubleshooting.html">
            
                
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                            <b>6.</b>
                        
                        排错
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        <li class="chapter " data-level="7" data-path="docs/Glossary.html">
            
                
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                            <b>7.</b>
                        
                        词汇表
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        <li class="chapter " data-level="8" data-path="docs/api/index.html">
            
                
                    <a href="../../../docs/api/index.html">
                
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                            <b>8.</b>
                        
                        API 文档
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            <ul class="articles">
                
    
        <li class="chapter " data-level="8.1" data-path="docs/api/createStore.html">
            
                
                    <a href="../../../docs/api/createStore.html">
                
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                            <b>8.1.</b>
                        
                        createStore
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        <li class="chapter " data-level="8.2" data-path="docs/api/Store.html">
            
                
                    <a href="../../../docs/api/Store.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.2.</b>
                        
                        Store
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        </li>
    
        <li class="chapter " data-level="8.3" data-path="docs/api/combineReducers.html">
            
                
                    <a href="../../../docs/api/combineReducers.html">
                
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                            <b>8.3.</b>
                        
                        combineReducers
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.4" data-path="docs/api/applyMiddleware.html">
            
                
                    <a href="../../../docs/api/applyMiddleware.html">
                
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                            <b>8.4.</b>
                        
                        applyMiddleware
                    </a>
            
            
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        <li class="chapter " data-level="8.5" data-path="docs/api/bindActionCreators.html">
            
                
                    <a href="../../../docs/api/bindActionCreators.html">
                
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                            <b>8.5.</b>
                        
                        bindActionCreators
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="8.6" data-path="docs/api/compose.html">
            
                
                    <a href="../../../docs/api/compose.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.6.</b>
                        
                        compose
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="9" data-path="docs/react-redux/index.html">
            
                
                    <a href="../../../docs/react-redux/index.html">
                
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                            <b>9.</b>
                        
                        react-redux 文档
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="docs/react-redux/api.html">
            
                
                    <a href="../../../docs/react-redux/api.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        API
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        </li>
    
        <li class="chapter " data-level="9.2" data-path="docs/react-redux/troubleshooting.html">
            
                
                    <a href="../../../docs/react-redux/troubleshooting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.2.</b>
                        
                        排错
                    </a>
            
            
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                            <b>10.</b>
                        
                        redux-tutorial
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        <a href="../../../" >Redux 中文文档 Join the chat at https://gitter.im/camsong/redux-in-chinese</a>
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                    <section class="normal" id="section-">
                    
                        <a id="edit-link" href="https://github.com/camsong/redux-in-chinese/tree/master/docs/recipes/reducers/ImmutableUpdatePatterns.md" class="btn fa fa-edit pull-left">&#xA0;&#xA0;&#x5F00;&#x59CB;&#x7EA0;&#x9519;</a><h1 id="%E4%B8%8D%E5%8F%AF%E5%8F%98%E6%9B%B4%E6%96%B0%E6%A8%A1%E5%BC%8F">&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x6A21;&#x5F0F;</h1>
<p>&#x5728; <a href="PrerequisiteConcepts.html">redux &#x57FA;&#x672C;&#x6982;&#x5FF5;&#x7684;&#x4E0D;&#x53EF;&#x53D8;&#x6570;&#x636E;&#x7BA1;&#x7406;</a> &#x4E2D;&#x7ED9;&#x51FA;&#x4E00;&#x4E9B;&#x793A;&#x4F8B;&#xFF0C;&#x6F14;&#x793A;&#x4E86;&#x4E0D;&#x53EF;&#x53D8;&#x7684;&#x57FA;&#x672C;&#x66F4;&#x65B0;&#x64CD;&#x4F5C;&#xFF0C;&#x4F8B;&#x5982;&#xFF0C;&#x66F4;&#x65B0;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x4E2D;&#x4E00;&#x4E2A;&#x5B57;&#x6BB5;&#xFF0C;&#x6216;&#x8005;&#xFF0C;&#x5728;&#x6570;&#x7EC4;&#x7684;&#x672B;&#x5C3E;&#x589E;&#x52A0;&#x4E00;&#x4E2A;&#x6570;&#x636E;&#x3002;&#x7136;&#x800C;&#xFF0C;reducer &#x7ECF;&#x5E38;&#x9700;&#x8981;&#x7EFC;&#x5408;&#x4F7F;&#x7528;&#x8FD9;&#x4E9B;&#x57FA;&#x672C;&#x64CD;&#x4F5C;&#x53BB;&#x5904;&#x7406;&#x66F4;&#x52A0;&#x590D;&#x6742;&#x7684;&#x4EFB;&#x52A1;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E9B;&#x4F60;&#x53EF;&#x80FD;&#x5FC5;&#x987B;&#x53BB;&#x5B9E;&#x73B0;&#x7684;&#x5E38;&#x89C1;&#x4EFB;&#x52A1;&#x7684;&#x4F8B;&#x5B50;&#x3002;</p>
<h2 id="%E6%9B%B4%E6%96%B0%E5%B5%8C%E5%A5%97%E7%9A%84%E5%AF%B9%E8%B1%A1">&#x66F4;&#x65B0;&#x5D4C;&#x5957;&#x7684;&#x5BF9;&#x8C61;</h2>
<p>&#x66F4;&#x65B0;&#x5D4C;&#x5957;&#x6570;&#x636E;&#x7684;&#x5173;&#x952E;&#x662F;&#x5FC5;&#x987B;&#x9002;&#x5F53;&#x5730;&#x590D;&#x5236;&#x548C;&#x66F4;&#x65B0;&#x5D4C;&#x5957;&#x7684;&#x6BCF;&#x4E2A;&#x7EA7;&#x522B;&#x3002;&#x8FD9;&#x5F80;&#x5F80;&#x662F;&#x90A3;&#x4E9B;&#x5B66;&#x4E60; redux &#x4E00;&#x4E2A;&#x96BE;&#x4EE5;&#x7406;&#x89E3;&#x7684;&#x6982;&#x5FF5;&#xFF0C;&#x5F53;&#x8BD5;&#x56FE;&#x66F4;&#x65B0;&#x5D4C;&#x5957;&#x5BF9;&#x8C61;&#x7684;&#x65F6;&#x5019;&#xFF0C;&#x6709;&#x4E00;&#x4E9B;&#x5177;&#x4F53;&#x7684;&#x95EE;&#x9898;&#x4F1A;&#x7ECF;&#x5E38;&#x51FA;&#x73B0;&#x3002;&#x8FD9;&#x4E9B;&#x610F;&#x5916;&#x7684;&#x5BFC;&#x81F4;&#x4E86;&#x76F4;&#x63A5;&#x53D8;&#x5316;&#xFF0C;&#x5E94;&#x8BE5;&#x88AB;&#x907F;&#x514D;&#x3002;</p>
<h5 id="%E5%B8%B8%E8%A7%81%E9%94%99%E8%AF%AF-1%EF%BC%9A%E6%8C%87%E5%90%91%E5%90%8C%E4%B8%80%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%96%B0%E5%8F%98%E9%87%8F">&#x5E38;&#x89C1;&#x9519;&#x8BEF; #1&#xFF1A;&#x6307;&#x5411;&#x540C;&#x4E00;&#x5BF9;&#x8C61;&#x7684;&#x65B0;&#x53D8;&#x91CF;</h5>
<p>&#x5B9A;&#x4E49;&#x4E00;&#x4E2A;&#x65B0;&#x53D8;&#x91CF;&#x4E0D;&#x4F1A;&#x521B;&#x5EFA;&#x4E00;&#x4E2A;&#x65B0;&#x7684;&#x5B9E;&#x9645;&#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x53EA;&#x521B;&#x5EFA;&#x53E6;&#x4E00;&#x4E2A;&#x5F15;&#x7528;&#x5230;&#x540C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;&#x3002;&#x8FD9;&#x4E2A;&#x9519;&#x8BEF;&#x7684;&#x793A;&#x4F8B;&#x5982;&#x4E0B;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">updateNestedState</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> nestedState <span class="token operator">=</span> state<span class="token punctuation">.</span>nestedState<span class="token punctuation">;</span>
    <span class="token comment" spellcheck="true">// &#x9519;&#x8BEF;: &#x8FD9;&#x5C06;&#x5BFC;&#x81F4;&#x76F4;&#x63A5;&#x4FEE;&#x6539;&#x5DF2;&#x7ECF;&#x5B58;&#x5728;&#x7684;&#x5BF9;&#x8C61;&#x5F15;&#x7528;-&#x4E0D;&#x8981;&#x8FD9;&#x4E48;&#x505A;!</span>
    nestedState<span class="token punctuation">.</span>nestedField <span class="token operator">=</span> action<span class="token punctuation">.</span>data<span class="token punctuation">;</span>

    <span class="token keyword">return</span> <span class="token punctuation">{</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">,</span>
        nestedState
    <span class="token punctuation">}</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#x6B63;&#x786E;&#x8FD4;&#x56DE;&#x4E86;&#x9876;&#x5C42;&#x72B6;&#x6001;&#x5BF9;&#x8C61;&#x7684;&#x6D45;&#x590D;&#x5236;&#xFF0C;&#x4F46;&#x662F;&#x53D8;&#x91CF; <code>nestedState</code> &#x4F9D;&#x7136;&#x6307;&#x5411;&#x5DF2;&#x7ECF;&#x5B58;&#x5728;&#x7684;&#x5BF9;&#x8C61;&#xFF0C;&#x8FD9;&#x4E2A;&#x72B6;&#x6001;&#x88AB;&#x76F4;&#x63A5;&#x4FEE;&#x6539;&#x4E86;&#x3002;</p>
<h5 id="%E5%B8%B8%E8%A7%81%E9%94%99%E8%AF%AF-2%EF%BC%9A%E4%BB%85%E4%BB%85%E5%9C%A8%E4%B8%80%E4%B8%AA%E5%B1%82%E7%BA%A7%E4%B8%8A%E5%81%9A%E6%B5%85%E5%A4%8D%E5%88%B6">&#x5E38;&#x89C1;&#x9519;&#x8BEF; #2&#xFF1A;&#x4EC5;&#x4EC5;&#x5728;&#x4E00;&#x4E2A;&#x5C42;&#x7EA7;&#x4E0A;&#x505A;&#x6D45;&#x590D;&#x5236;</h5>
<p>&#x8FD9;&#x4E2A;&#x9519;&#x8BEF;&#x7684;&#x53E6;&#x5916;&#x4E00;&#x4E2A;&#x5E38;&#x89C1;&#x7248;&#x672C;&#x7684;&#x5982;&#x4E0B;&#x6240;&#x793A;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">updateNestedState</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment" spellcheck="true">// &#x95EE;&#x9898;: &#x8FD9;&#x4EC5;&#x4EC5;&#x505A;&#x4E86;&#x6D45;&#x590D;&#x5236;&#xFF01;</span>
    <span class="token keyword">let</span> newState <span class="token operator">=</span> <span class="token punctuation">{</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">}</span><span class="token punctuation">;</span>

    <span class="token comment" spellcheck="true">// &#x9519;&#x8BEF;: nestedState &#x4ECD;&#x7136;&#x662F;&#x540C;&#x4E00;&#x4E2A;&#x5BF9;&#x8C61;!</span>
    newState<span class="token punctuation">.</span>nestedState<span class="token punctuation">.</span>nestedField <span class="token operator">=</span> action<span class="token punctuation">.</span>data<span class="token punctuation">;</span>

    <span class="token keyword">return</span> newState<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x505A;&#x4E00;&#x4E2A;&#x9876;&#x5C42;&#x7684;&#x6D45;&#x590D;&#x5236;&#x662F;&#x4E0D;&#x591F;&#x7684; - <code>nestedState</code> &#x5BF9;&#x8C61;&#x4E5F;&#x5E94;&#x8BE5;&#x88AB;&#x590D;&#x5236;&#x3002;</p>
<h5 id="%E6%AD%A3%E7%A1%AE%E6%96%B9%E6%B3%95%EF%BC%9A%E5%A4%8D%E5%88%B6%E5%B5%8C%E5%A5%97%E6%95%B0%E6%8D%AE%E7%9A%84%E6%89%80%E6%9C%89%E5%B1%82%E7%BA%A7">&#x6B63;&#x786E;&#x65B9;&#x6CD5;&#xFF1A;&#x590D;&#x5236;&#x5D4C;&#x5957;&#x6570;&#x636E;&#x7684;&#x6240;&#x6709;&#x5C42;&#x7EA7;</h5>
<p>&#x4E0D;&#x5E78;&#x7684;&#x662F;&#xFF0C;&#x6B63;&#x786E;&#x5730;&#x4F7F;&#x7528;&#x4E0D;&#x53D8;&#x7684;&#x66F4;&#x65B0;&#x53BB;&#x6DF1;&#x5EA6;&#x5D4C;&#x5957;&#x72B6;&#x6001;&#x7684;&#x8FC7;&#x7A0B;&#x5F88;&#x5BB9;&#x6613;&#x53D8;&#x5F97;&#x5197;&#x957F;&#x96BE;&#x8BFB;&#x3002; &#x66F4;&#x65B0; <code>ate<span class="token punctuation">.</span>first<span class="token punctuation">.</span>second<span class="token punctuation">[</span>someId<span class="token punctuation">]</span><span class="token punctuation">.</span>fourth</code> &#x7684;&#x793A;&#x4F8B;&#x5927;&#x6982;&#x5982;&#x4E0B;&#x6240;&#x793A;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">updateVeryNestedField</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">{</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">,</span>
        first <span class="token punctuation">:</span> <span class="token punctuation">{</span>
            <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>first<span class="token punctuation">,</span>
            second <span class="token punctuation">:</span> <span class="token punctuation">{</span>
                <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>first<span class="token punctuation">.</span>second<span class="token punctuation">,</span>
                <span class="token punctuation">[</span>action<span class="token punctuation">.</span>someId<span class="token punctuation">]</span> <span class="token punctuation">:</span> <span class="token punctuation">{</span>
                    <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>state<span class="token punctuation">.</span>first<span class="token punctuation">.</span>second<span class="token punctuation">[</span>action<span class="token punctuation">.</span>someId<span class="token punctuation">]</span><span class="token punctuation">,</span>
                    fourth <span class="token punctuation">:</span> action<span class="token punctuation">.</span>someValue
                <span class="token punctuation">}</span>
            <span class="token punctuation">}</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x663E;&#x7136;&#xFF0C;&#x6BCF;&#x4E00;&#x5C42;&#x5D4C;&#x5957;&#x4F7F;&#x5F97;&#x9605;&#x8BFB;&#x66F4;&#x52A0;&#x56F0;&#x96BE;&#xFF0C;&#x5E76;&#x7ED9;&#x4E86;&#x66F4;&#x591A;&#x72AF;&#x9519;&#x7684;&#x673A;&#x4F1A;&#x3002;&#x8FD9;&#x662F;&#x5176;&#x4E2D;&#x4E00;&#x4E2A;&#x539F;&#x56E0;&#xFF0C;&#x9F13;&#x52B1;&#x4F60;&#x4FDD;&#x6301;&#x72B6;&#x6001;&#x6241;&#x5E73;&#xFF0C;&#x5C3D;&#x53EF;&#x80FD;&#x6784;&#x5EFA; reducer&#x3002;</p>
<h2 id="%E5%9C%A8%E6%95%B0%E7%BB%84%E4%B8%AD%E6%8F%92%E5%85%A5%E5%92%8C%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE">&#x5728;&#x6570;&#x7EC4;&#x4E2D;&#x63D2;&#x5165;&#x548C;&#x5220;&#x9664;&#x6570;&#x636E;</h2>
<p>&#x901A;&#x5E38;&#xFF0C;&#x4E00;&#x4E2A; Javascript &#x6570;&#x7EC4;&#x4E2D;&#x5185;&#x5BB9;&#x4F7F;&#x7528;&#x53D8;&#x5316;&#x7684;&#x51FD;&#x6570;&#x6765;&#x4FEE;&#x6539;&#xFF0C;&#x4F8B;&#x5982;&#xFF0C;<code>push</code> , <code>unshift</code>, <code>shift</code> &#x3002;&#x56E0;&#x4E3A;&#x6211;&#x4EEC;&#x4E0D;&#x60F3;&#x5728; reducer &#x4E2D;&#x76F4;&#x63A5;&#x4FEE;&#x6539;&#x72B6;&#x6001;&#xFF0C;&#x8FD9;&#x4E9B;&#x901A;&#x5E38;&#x5E94;&#x8BE5;&#x88AB;&#x907F;&#x514D;&#x3002;&#x6B63;&#x56E0;&#x5982;&#x6B64;&#xFF0C;&#x4F60;&#x53EF;&#x80FD;&#x4F1A;&#x770B;&#x5230; &#x201C;&#x63D2;&#x5165;&#x201D; &#x548C; &#x201C;&#x5220;&#x9664;&#x201D; &#x7684;&#x884C;&#x4E3A;&#x5982;&#x4E0B;&#x6240;&#x793A;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">insertItem</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">[</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">.</span>index<span class="token punctuation">)</span><span class="token punctuation">,</span>
        action<span class="token punctuation">.</span>item<span class="token punctuation">,</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>index<span class="token punctuation">)</span>
    <span class="token punctuation">]</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">removeItem</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> <span class="token punctuation">[</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">.</span>index<span class="token punctuation">)</span><span class="token punctuation">,</span>
        <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>index <span class="token operator">+</span> <span class="token number">1</span><span class="token punctuation">)</span>
    <span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x4F46;&#x662F;&#xFF0C;&#x8BF7;&#x8BB0;&#x4F4F;&#xFF0C;&#x5173;&#x952E;&#x662F;&#x539F;&#x59CB;&#x5185;&#x5B58;&#x4E2D;&#x7684;&#x5F15;&#x7528;&#x6CA1;&#x6709;&#x88AB;&#x4FEE;&#x6539;&#x3002;<strong>&#x53EA;&#x8981;&#x9996;&#x5148;&#x6211;&#x4EEC;&#x505A;&#x4E86;&#x590D;&#x5236;&#xFF0C;&#x6211;&#x4EEC;&#x5C31;&#x53EF;&#x4EE5;&#x5B89;&#x5168;&#x7684;&#x53D8;&#x5316;&#x8FD9;&#x4E2A;&#x590D;&#x5236;&#x3002;</strong> &#x8BF7;&#x6CE8;&#x610F;&#xFF0C;&#x8FD9;&#x4E2A;&#x5BF9;&#x4E8E;&#x6570;&#x7EC4;&#x548C;&#x5BF9;&#x8C61;&#x90FD;&#x662F;&#x6B63;&#x786E;&#x7684;&#xFF0C;&#x4F46;&#x5D4C;&#x5957;&#x7684;&#x6570;&#x636E;&#x4ECD;&#x7136;&#x5FC5;&#x987B;&#x4F7F;&#x7528;&#x76F8;&#x540C;&#x7684;&#x89C4;&#x5219;&#x66F4;&#x65B0;&#x3002;</p>
<p>&#x8FD9;&#x610F;&#x5473;&#x7740;&#x6211;&#x4EEC;&#x4E5F;&#x53EF;&#x4EE5;&#x7F16;&#x5199;&#x63D2;&#x5165;&#x548C;&#x5220;&#x9664;&#x51FD;&#x6570;&#x5982;&#x4E0B;&#x6240;&#x793A;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">insertItem</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> newArray <span class="token operator">=</span> array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    newArray<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>index<span class="token punctuation">,</span> <span class="token number">0</span><span class="token punctuation">,</span> action<span class="token punctuation">.</span>item<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> newArray<span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token keyword">function</span> <span class="token function">removeItem</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> newArray <span class="token operator">=</span> array<span class="token punctuation">.</span><span class="token function">slice</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    newArray<span class="token punctuation">.</span><span class="token function">splice</span><span class="token punctuation">(</span>action<span class="token punctuation">.</span>index<span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> newArray<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<p>&#x5220;&#x9664;&#x51FD;&#x6570;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;&#x8FD9;&#x6837;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">removeItem</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> array<span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span> <span class="token punctuation">(</span>item<span class="token punctuation">,</span> index<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> index <span class="token operator">!</span><span class="token operator">==</span> action<span class="token punctuation">.</span>index<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h2 id="%E5%9C%A8%E4%B8%80%E4%B8%AA%E6%95%B0%E7%BB%84%E4%B8%AD%E6%9B%B4%E6%96%B0%E4%B8%80%E4%B8%AA%E9%A1%B9%E7%9B%AE">&#x5728;&#x4E00;&#x4E2A;&#x6570;&#x7EC4;&#x4E2D;&#x66F4;&#x65B0;&#x4E00;&#x4E2A;&#x9879;&#x76EE;</h2>
<p>&#x66F4;&#x65B0;&#x6570;&#x7EC4;&#x7684;&#x4E00;&#x9879;&#x53EF;&#x4EE5;&#x4F7F;&#x7528; <code>Array<span class="token punctuation">.</span>map</code>, &#x8FD4;&#x56DE;&#x6211;&#x4EEC;&#x60F3;&#x8981;&#x66F4;&#x65B0;&#x90A3;&#x9879;&#x7684;&#x4E00;&#x4E2A;&#x65B0;&#x503C;&#xFF0C;&#x548C;&#x5176;&#x4ED6;&#x9879;&#x539F;&#x5148;&#x7684;&#x503C;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">function</span> <span class="token function">updateObjectInArray</span><span class="token punctuation">(</span>array<span class="token punctuation">,</span> action<span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token keyword">return</span> array<span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span> <span class="token punctuation">(</span>item<span class="token punctuation">,</span> index<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">&gt;</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span><span class="token punctuation">(</span>index <span class="token operator">!</span><span class="token operator">==</span> action<span class="token punctuation">.</span>index<span class="token punctuation">)</span> <span class="token punctuation">{</span>
            <span class="token comment" spellcheck="true">// &#x8FD9;&#x4E0D;&#x662F;&#x6211;&#x4EEC;&#x5173;&#x5FC3;&#x7684;&#x9879;-&#x4FDD;&#x6301;&#x539F;&#x6765;&#x7684;&#x503C;</span>
            <span class="token keyword">return</span> item<span class="token punctuation">;</span>
        <span class="token punctuation">}</span>

        <span class="token comment" spellcheck="true">// &#x5426;&#x5219;, &#x8FD9;&#x662F;&#x6211;&#x4EEC;&#x5173;&#x5FC3;&#x7684;-&#x8FD4;&#x56DE;&#x4E00;&#x4E2A;&#x66F4;&#x65B0;&#x7684;&#x503C;</span>
        <span class="token keyword">return</span> <span class="token punctuation">{</span>
            <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>item<span class="token punctuation">,</span>
            <span class="token punctuation">.</span><span class="token punctuation">.</span><span class="token punctuation">.</span>action<span class="token punctuation">.</span>item
        <span class="token punctuation">}</span><span class="token punctuation">;</span>    
    <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre>
<h2 id="%E4%B8%8D%E5%8F%AF%E5%8F%98%E6%9B%B4%E6%96%B0%E5%B7%A5%E5%85%B7%E5%BA%93">&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x5DE5;&#x5177;&#x5E93;</h2>
<p>&#x56E0;&#x4E3A;&#x7F16;&#x5199;&#x4E0D;&#x53EF;&#x53D8;&#x7684;&#x66F4;&#x65B0;&#x4EE3;&#x7801;&#x53EF;&#x80FD;&#x53D8;&#x5F97;&#x4E4F;&#x5473;&#xFF0C;&#x6240;&#x4EE5;&#x6709;&#x8BB8;&#x591A;&#x5DE5;&#x5177;&#x7A0B;&#x5E8F;&#x5E93;&#x8BD5;&#x56FE;&#x62BD;&#x8C61;&#x51FA;&#x8FD9;&#x4E2A;&#x8FC7;&#x7A0B;&#x3002;&#x8FD9;&#x4E9B;&#x5E93;&#x5728; API &#x548C;&#x7528;&#x6CD5;&#x4E0A;&#x6709;&#x6240;&#x4E0D;&#x540C;&#xFF0C;&#x4F46;&#x90FD;&#x8BD5;&#x56FE;&#x63D0;&#x4F9B;&#x4E00;&#x79CD;&#x66F4;&#x77ED;&#x548C;&#x66F4;&#x7B80;&#x6D01;&#x7684;&#x65B9;&#x5F0F;&#x6765;&#x7F16;&#x5199;&#x8FD9;&#x4E9B;&#x66F4;&#x65B0;&#x3002;&#x6709;&#x4E9B;&#xFF0C;&#x50CF; <a href="https://github.com/debitoor/dot-prop-immutable" target="_blank">dot-prop-immutable</a> &#xFF0C;&#x4F7F;&#x7528;&#x5B57;&#x7B26;&#x4E32;&#x8DEF;&#x5F84;&#x4F5C;&#x4E3A;&#x547D;&#x4EE4;&#xFF1A;</p>
<pre><code class="lang-javascript">state <span class="token operator">=</span> dotProp<span class="token punctuation">.</span><span class="token keyword">set</span><span class="token punctuation">(</span>state<span class="token punctuation">,</span> `todos<span class="token punctuation">.</span>$<span class="token punctuation">{</span>index<span class="token punctuation">}</span><span class="token punctuation">.</span>complete`<span class="token punctuation">,</span> <span class="token keyword">true</span><span class="token punctuation">)</span>
</code></pre>
<p>&#x5176;&#x4ED6;&#x7684;&#xFF0C;&#x4F8B;&#x5982;  <a href="https://github.com/kolodny/immutability-helper" target="_blank">immutability-helper</a> &#xFF08;&#x73B0;&#x5728;&#x8FC7;&#x65F6;&#x7684; React &#x4E0D;&#x53EF;&#x53D8;&#x52A9;&#x624B;&#x63D2;&#x4EF6;&#x7684;&#x4E00;&#x4E2A;&#x590D;&#x5236;&#xFF09;&#xFF0C;&#x4F7F;&#x7528;&#x5D4C;&#x5957;&#x6570;&#x636E;&#x548C;&#x52A9;&#x624B;&#x51FD;&#x6570;&#xFF1A;</p>
<pre><code class="lang-javascript"><span class="token keyword">var</span> collection <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">2</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>a<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token number">12</span><span class="token punctuation">,</span> <span class="token number">17</span><span class="token punctuation">,</span> <span class="token number">15</span><span class="token punctuation">]</span><span class="token punctuation">}</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">var</span> newCollection <span class="token operator">=</span> <span class="token function">update</span><span class="token punctuation">(</span>collection<span class="token punctuation">,</span> <span class="token punctuation">{</span><span class="token number">2</span><span class="token punctuation">:</span> <span class="token punctuation">{</span>a<span class="token punctuation">:</span> <span class="token punctuation">{</span>$splice<span class="token punctuation">:</span> <span class="token punctuation">[</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">1</span><span class="token punctuation">,</span> <span class="token number">13</span><span class="token punctuation">,</span> <span class="token number">14</span><span class="token punctuation">]</span><span class="token punctuation">]</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre>
<p>&#x8FD9;&#x4E9B;&#x53EF;&#x4EE5;&#x6709;&#x6548;&#x7684;&#x66FF;&#x4EE3;&#x4E86;&#x624B;&#x5199;&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x903B;&#x8F91;&#x3002;</p>
<p>&#x8BB8;&#x591A;&#x4E0D;&#x53EF;&#x53D8;&#x66F4;&#x65B0;&#x5DE5;&#x5177;&#x7684;&#x5217;&#x8868;&#x53EF;&#x4EE5;&#x5728;  <a href="https://github.com/markerikson/redux-ecosystem-links/blob/master/immutable-data.md#immutable-update-utilities" target="_blank">Immutable Data#Immutable Update Utilities</a> &#x7684;  <a href="https://github.com/markerikson/redux-ecosystem-links" target="_blank">Redux Addons Catalog</a> &#x90E8;&#x5206;&#x627E;&#x5230;&#x3002;</p>

                    
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